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Message:: [QUOTE="littlehugger, post: 2108356, member: 58633"]Yes, many do not clean. But many do, including highly reputable TPG services. They just disguise it by calling it "conserving" The existence of a grading class titled "Improperly Cleaned" implies there are proper methods. The existence of a "Conserving" service verifies it. Near as I can tell, the difference between "Proper" and "Improper" is the fact you paid them a bundle to clean it. The fact remains, that coins can be, and are "Properly" cleaned, without devaluing them. In fact, the use of the term "Conserving" indicates that it adds to the coins preservation when done right. For once, I would like to see a thorough discussion regarding the various techniques and methods that work and are acceptable. Copper versus silver. Olive oil, boiling, sonic cleaners and other non-destructive types. I have looked online, but it always seems to be the same old "Yes!" "No!" argument, and rarely anything useful or definitive. Somebody knows this stuff.[/QUOTE]